Expert Reviewer: David Chen, Professional Astrologer & Data Scientist
Discover your inner emotional landscape and your outward personality. This moon sign rising sign calculator uses precise astronomical algorithms to determine your astrological blueprint based on your exact birth time and location.
Moon Sign & Rising Sign Calculator
Your Moon Sign:
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Your Rising Sign (Ascendant):
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Moon Sign & Rising Sign Calculator Formula
Rising Sign (Ascendant) Formula:
$ASC = \text{atan2}(-\cos(LST), \sin(LST) \cdot \cos(\epsilon) + \tan(\phi) \cdot \sin(\epsilon))$
Where $LST$ is Local Sidereal Time, $\epsilon$ is the obliquity of the ecliptic, and $\phi$ is the Latitude.
Reference: Astrologer.com – The Ascendant | Wikipedia: Ascendant
Variables:
- Birth Date & Time: Determines the exact positions of celestial bodies.
- Timezone: Essential to normalize your birth time to UTC.
- Latitude: Determines the horizon line at your birth location.
- Longitude: Determines the Local Sidereal Time (LST).
Related Calculators
What is Moon Sign and Rising Sign?
Your Moon Sign represents your emotional nature, your subconscious habits, and how you react to the world on a deep, instinctive level. While your Sun sign represents your ego and identity, your Moon sign is “who you are when you’re alone.”
The Rising Sign (or Ascendant) is the zodiac sign that was rising on the eastern horizon at the moment and location of your birth. It represents your physical appearance, your temperament, and the first impression you make on others—it is the “mask” you wear in public.
How to Calculate Moon Sign & Rising Sign (Example)
- Convert Time: Start with birth time (e.g., 10:00 AM PST) and convert to UTC (18:00 UTC).
- Julian Day: Calculate the Julian Day for the birth date.
- Calculate LST: Determine Local Sidereal Time based on Longitude.
- Solve Equations: Apply the Ascendant formula for the Rising sign and lunar orbital equations for the Moon sign.
- Assign Sign: Match the calculated degrees (0-360) to the corresponding 12 zodiac signs.
Frequently Asked Questions (FAQ)
Is birth time necessary for the Moon sign? Yes, the Moon moves very quickly (about 1 degree every 2 hours), so birth time is crucial for accuracy.
Can I calculate my Rising sign without birth time? No. The Rising sign changes roughly every two hours; without a time, the result is purely a guess.
Why do calculators give different results? Differences usually arise from different house systems (Placidus vs. Whole Sign) or different astronomical data sets (Ephemeris vs. approximations).
What is the “Big Three”? In astrology, your Big Three includes your Sun sign, Moon sign, and Rising sign.